Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-06-25
1999-06-08
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525179, C08F 830
Patent
active
059105445
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the field of art of a thermoplastic elastomer composition superior in, for example, resistance to gas and moisture permeation, flexibility, and suited for hoses for the transport of a refrigerant, such as fluorocarbon gases and for the transport of a fuel such as gasoline, light oil, and of a process for producing the same and also relates to the field of art of low permeability hoses using this thermoplastic elastomer composition. The present invention further relates to a thermoplastic elastomer composition having an excellent flexibility and resistance to gas permeation which enables the elastomer component to be made the discontinuous phase and the thermoplastic resin component to be made the continuous phase and further which enables achievement of a high elastomer component ratio, more particularly relates to a low permeability hose which makes the hose inner tube or other gas barrier layer thinner to lighten the weight of the same by using the above thermoplastic elastomer composition as the gas barrier layer. The present invention further relates to a thermoplastic elastomer resin composition comprising a rubber/matrix thermoplastic resin/gas barrier thermoplastic resin which, in addition to flexibility, vastly enhances the gas barrier property by controlling the morphology of the low permeability thermoplastic resin composition (gas barrier thermoplastic resin) layer, whereby the air (gas) barrier layer in the hose can be made thinner and can considerably reduce the weight, and to a process for the production of such a composition. The present invention further relates to a functional thermoplastic elastomer composition which comprises a thermoplastic resin component as its continuous phase and an elastomer component as its dispersed face wherein at least partially cross-linked thermoplastic composition imparts the inherent rubber elasticity function and further the desired functionalities (e.g., adhesiveness, antistatic property, barrier property, UV absorption, and biocompatibility), a process for its production, and a hose using that functional thermoplastic elastomer composition.
BACKGROUND ART
In recent years, as is well known, there have been increasingly stronger calls for reduction of the weight of the hoses used for fluorocarbon gases etc. and the hoses used for transporting fuels using low molecular weight hydrocarbon compounds.
However, use of hoses which have been processed to prevent permeation of the refrigerant or fuel as the hoses for transport of refrigerants or for transport of fuels is important in terms of environmental protection. The important properties which the materials used for such applications should have are a superior gas barrier property and moisture barrier property with respect to Freon gas, hydrocarbon gas, etc., an excellent flexibility, a superior heat resistance, and a high rate of retention of physical properties when heated.
For example, in the above various applications in automobile air-conditioners etc. in the past chlorofluorocarbons (CFCs), which is one type of fluorocarbon gas, are used as the refrigerant. However, as is well known in the art, fluorocarbons are problematical in that they cause destruction of the ozone layer, global warming, and other destruction of the environment. Therefore, use of certain types of fluorocarbons has been prohibited and alternative fluorocarbons such as hydrofluorocarbons (HFCs) not containing chlorine have come into use. These alternative fluorocarbons are less destructive to the ozone layer, but remain problematical in terms of global warming, and therefore, hoses for transport of refrigerants are still required to have a superior gas barrier property to prevent the refrigerant gas from being discharged to the outside.
On the other hand, if the moisture barrier property of hoses is low, moisture will pass through the hoses into the refrigerant and causes freezing. The ice will become a cause of breakdowns in the apparatus such as ending up breaking the compressor e
REFERENCES:
patent: 5591551 (1997-01-01), Audett
Aoyagi Yoshihiro
Kawaguchi Gou
Kawazura Tetsuji
Kuroda Noriaki
Ozawa Osamu
Mosley Terressa
The Yokohama Rubber Co. Ltd.
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